ISO/IEC 80079-34:2011 specifies particular requirements and information
for establishing and maintaining a quality system to manufacture Ex equipment
including protective systems in accordance with the Ex certificate. It does not
preclude the use of other quality systems that are compatible with the
objectives of ISO 9001:2008 and which provide equivalent results. This
publication is published as a double logo standard. This standard should be
read in conjunction with ISO 9001:2008.